Metal partitioning between colloidal and dissolved phases and its relation with bioavailability to American oysters

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dc.acquisition-srcDownloaded from-Aquatic Sciences and Fisheries Abstractsen_US
dc.call-noen_US
dc.contract-noen_US
dc.contributor.authorGuo Len_US
dc.contributor.authorSantschi PHen_US
dc.contributor.authorRay SMen_US
dc.contributor.otherMarine Environmental Researchen_US
dc.date.accessioned2010-02-15T17:13:35Z
dc.date.available2010-02-15T17:13:35Z
dc.date.issued2002en_US
dc.degreeen_US
dc.description49-64en_US
dc.description-otheren_US
dc.description.abstractKinetics and the extent of metal partitioning between colloidal and dissolved phases and coagulation of metals associated with colloids were examined to determine their effects on the bioavailability of selected metals (Cd, Co, Hg, Fe and Zn) to American oysters (Crassostrea virginica) using radiotracer and short term exposure experiments. After dispersion of radiolabeled colloids into low molecular weight (LMW, < 1 kDa) seawater, metal partitioning between dissolved (< 1kDa) and colloidal (1 kDa-0.2 micro m) phases resulted in a consistent pattern, with a relatively constant percentage in the colloidal phase for each metal. On average, about 90% of Hg and Fe, approximately 60% of Ag and approximately 40% of Zn, Co, and Cd were measured in the colloidal fraction during a short term exposure experiment, consistent with their partitioning in natural waters. Controlled laboratory experiments carried out in parallel using radioactively tagged colloids showed that coagulation of colloidal species, quantified as the fraction retained by a 0.2 micro m filter, was insignificant for most metals under the conditions and time periods of the uptake experiments. The bioavailability of colloidally complexed metals, measured in terms of dry weight concentration factor (DCF, ml g super(-1)) and uptake rate constant (ml g super(-1) h super(-1)), was somewhat depressed compared with their counterpart in the LMW treatment, but could be well predicted from the results of the LMW treatment and metal partitioning. Both DCF values and uptake rate constants were higher in the LMW treatment than in the colloidal treatment. In addition, B-type metals, such as Ag, Hg, and Zn, all had higher values of DCF and uptake rate constants, regardless of treatments, except for Cd which had a lower DCF and uptake rate constant. In contrast, Co and Fe had significantly lower DCF values and uptake rate constants. Most of Hg and Ag (60-80%) were measured in the soft tissue of oysters in both LMW and colloidal treatments. In contrast, 80% of Fe, 75% of Co, and approximately 60% of Cd were observed on the shell, while Zn was found evenly distributed between shell and soft tissue of oysters. These results agree well with the variation pattern of both DCF value and uptake rate constant for these two groups of metalsen_US
dc.description.urihttp://gbic.tamug.edu/request.htmen_US
dc.historyen_US
dc.identifier.urihttp://hdl.handle.net/1969.3/22955
dc.latitudeen_US
dc.locationen_US
dc.longitudeen_US
dc.notes0141-1136Physical medium: Printed matterEnglishEnglishJournal ArticleMarineMB0300989en_US
dc.placeen_US
dc.publisheren_US
dc.relation.ispartofseries50437.00en_US
dc.relation.urien_US
dc.scaleen_US
dc.seriesen_US
dc.subjectASW,USA,Texas,Galveston Bayen_US
dc.subjectbioaccumulationen_US
dc.subjectColloidsen_US
dc.subjectConcentration factoren_US
dc.subjectCrassostreaen_US
dc.subjectCrassostrea virginicaen_US
dc.subjectDispersionen_US
dc.subjectdissolved organic carbonen_US
dc.subjectDry weighten_US
dc.subjectEastern oysteren_US
dc.subjectEnvironmental monitoringen_US
dc.subjectKineticsen_US
dc.subjectMetalsen_US
dc.subjectMolecular weighten_US
dc.subjectnatural wateren_US
dc.subjectOystersen_US
dc.subjectQ5 01502 Methods and instrumentsen_US
dc.subjectQ5 01504 Effects on organismsen_US
dc.subjectToxicityen_US
dc.subjectUptakeen_US
dc.subjectUSAen_US
dc.subjectwateren_US
dc.subjectWater qualityen_US
dc.titleMetal partitioning between colloidal and dissolved phases and its relation with bioavailability to American oystersen_US
dc.typeJournalen_US
dc.universityen_US
dc.vol-issue(1)en_US

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